package sealte.hvpms.util;

import java.io.IOException;   
import javax.servlet.Filter;   
import javax.servlet.FilterChain;   
import javax.servlet.FilterConfig;   
import javax.servlet.ServletException;   
import javax.servlet.ServletRequest;   
import javax.servlet.ServletResponse;   
 
public class SetCharacterEncodingFilter implements Filter { 
    protected String encoding = null;
    protected FilterConfig filterConfig = null;
    protected boolean ignore = true;
    public void destroy() {   
        this.encoding = null;   
        this.filterConfig = null;   
    }   
   
    public void doFilter(ServletRequest request, ServletResponse response,   
                         FilterChain chain)   
    throws IOException, ServletException {   
        // Conditionally select and set the character encoding to be used   
        if (ignore || (request.getCharacterEncoding() == null)) {   
            String encoding = selectEncoding(request);   
            if (encoding != null)   
                request.setCharacterEncoding(encoding);   
                response.setCharacterEncoding(encoding);   
        }   
        // Pass control on to the next filter   
        chain.doFilter(request, response);   
    }   
    
    public void init(FilterConfig filterConfig) throws ServletException {   
        this.filterConfig = filterConfig;   
        this.encoding = filterConfig.getInitParameter("encoding");   
        String value = filterConfig.getInitParameter("ignore");   
        if (value == null)   
            this.ignore = true;   
        else if (value.equalsIgnoreCase("true"))   
            this.ignore = true;   
        else if (value.equalsIgnoreCase("yes"))   
            this.ignore = true;   
        else  
            this.ignore = false;   
    }   
   
    protected String selectEncoding(ServletRequest request) {   
        return (this.encoding);   
    }   
}  
